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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 6: a.4(x-7)-37=3 b.80-7(x+4)=31 c.(2x-6).4^7=4^9

Toán Lớp 6: a.4(x-7)-37=3
b.80-7(x+4)=31
c.(2x-6).4^7=4^9

Comments ( 2 )

  1. a)4(x-7)-37=3
    4.(x-7)=3+37=40
    x-7=40:4=10
    x=10+7=17
    b)80-7.(x+4)=31
    7.(x+4)=80-31=49
    x+4=49:7
    x+4=7
    x=7-4=3
    c)(2x-6) . 4^7 = 4^9
    2x-6=4^9 : 4^7=4^2
    2x-6=16
    2x=16+6=22
    x=22:2=11
     

  2.  
    Lời giải và giải thích chi tiết:
     a,4(x-7)-37=3
    4(x-7)=3+37
    4(x-7)=40
    x-7=40:4
    x-7=10
    x=10+7
    x=17
    Vậy x=17
    b.80-7(x+4)=31
    7(x+4)=80-31
    7(x+4)=49
    x+4=49:7
    x+4=7
    x=7-4
    x=3
    Vậy x=3
    c,$(2x-6).4^{7}=4^{9}$
    $2x-6=4^{9}:4^{7}$
    $2x-6=4^{2}$
    $2x-6=16$
    $2x=16+6$
    $2x=22$
    x=22:2
    x=11
    Vậy x=11

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222-9+11+12:2*14+14 = ? ( )

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